Feed-controlling device



e. H GILMAN. FEED CONTROLLING DEVICE. FILED FEB. 15. 191.9.

Jan 9, 1923. L

ll atented .llan. a, 'JMEW "GEORGE H. GILMAN, 01E CIAHEMIQN'E, NEW HAMPSHIBJE, ASSIGNOB TO SULLIVAN MACHINERY COMPANY, .ll. UUEPORATION 01E MASSACHUSETTS.

JFLEED-CONTRULLING DEVICE.

Application tiled February 15, 19.19. Serial No. 277,383

To all "UILOWL it may concern:

lie it knownt' that I, GEORGE H. GILMAN, a citizen of the United States, residing at Claremont, in the county ofSullivan and State of New Hampshire, have invented certain new and useful improvements in Feed-Controlling Devices, of which the following is a full, clear, and exact specification. v

This invention relates to feed controlling devices, and more especially, though not exclusively, to means for controlling the action-of the pressure fluid feed cylinder and piston of a pressure fluid impact tool, such, for example, as a stoping rock drill. V My invention has for its object to provide an improved feed controlling means for varying the feed of a feeding mechanism. Another objectof the present invention is to provide an improved retarding or brakinn means for controlling the feeding move ment of the pneumatic tool; Still another object of my invention is to provide a simple, rugged braking attachment for stoping drills. These and other objects and:

advantages of my improvement will, howevpr, hereinafter more fully appear.

in the accompanying drawings I have shown for purposes of illustration several embodiments which-my invention may assume in practice.

lln these drawings,-

Fig. 1 is a side elevation of a stoping drill provided with my. improved retarding means.

Fig. 2 is a longitudinal sectional view of a part thereof, taken substantially on the line 22 of Fig. 1.

Fig; 3 is a transverse sectional view substantially on the line 33 of Fig. 2.

Fig. l is atransverse sectional view substantially on the line 1-4 of Fig. 2, show- .ing' a modification. Figs. 5 and 6 are side elevations of another modified form of my stoping drill.

lln these illustrative constructions l have shown a pneumatic hammer 1 having a piston 2 movable therein and adapted in its forward movement to strike the shank end of a drill steel 3 to force the bit end of the latter against the material to be cut. Mounted on the rear end of this cylinder 1 is a cylinder head block a which forms the forward cylinder headof an air feed cylinder 5, the latter having mounted therein an air feed piston rod tiicarrying on its inner end an air feed piston 7. The piston '7 is preferably provided in a well known mannor with a plurality of cup leathers 8 to make the piston air tight with respect to the cylinder 5. The rear end of the air feed cylinder 5 is partially closed by a bushing 9, the air feed piston passing through an opening; formed centrally therein. In sto'ping' drills wherein pressure fluid is admitted. to both sides of the air feed piston head, this bushing will constitute the rear cylinder head. i i

As is common in devices of this type now used commercially, a pneumatic cylinder head plug 10 is carried by the cylinder head block 4, this plug being provided with a collar 11 formed thereon in such a manner that it projects into the air feed cylinder 5 and that a recess 12 is formed between this collar and the forward end of the feed cyl inder. A recess 13 is formed in the feed piston 7 in axial alinement with the collar 11 in such a manner that the collar may be received by the recessed piston head when the latter is in its innermost position, and a non-positive locking ring" 14 is, mounted in this recess 13 to frictionally engage the outer surface of the collar 11 to hold the piston against displacement when it is de sired to transport the stoping drill.

form of my invention shown herein I have provided for this purpose a handle 15, which is preferably made hollow lll'OIClQldJhflb it may also serve as an oil reservoir. A lilling. cap .16 is provided on the outer end of the handle to permit the filling of the latter withlubricant. A. valve 17 is preferably mounted on the opposite side from the han tile 15, this valve ,serving to control the pressure fluid supply from the supply line 17 to both the pneumatic feed cylinder and the pneumatic tool. Since the parts so far described are common to certain types of well known stoping drills, it is thought that a further description of these parts or their operation is unnecessary. f

In my improved braking means, asshown in Figs. 1, 2, and. 3, ll preferably use a yoke 21 which is preferably threaded into the end of the hollow piston rod 6 and carries adjacent the, threaded section a shoulder 22 which in the present case abuts against the yoke 19 and forces this yoke into tight fric tional engagement with the end of the feed piston rod. To facilitate-the assembling of the parts as above described, the feed piston 'point is preferably flatted on opposite sides, as shown at 23, for the reception of a Wrench.

In my preferred form of braking means, I preferably employ two longitudinally extending side rods 24: fastened at their outer ends to lugs 25 formed integral with the yoke 19, by any 'means, such as riveting, the opposite ends of these rods being rigidly secured to cars 26 formed integral with a. split-ring 27 which encircles the feed cylinder 5. To facilitate assembling of the parts and the operation of the retarding mechanism, this split ring is made of'two parts which are hingedly secured together, as shown at 28, each of the parts having integrally formed therewith at a point on the opposite side from the hinge 28, a lug 29. Mounted in each of these lugs is a freely rotating, cylindrical, centrally threaded nut 30,- the threads in these nuts being preferably cut in opposite directions. As is clearly shown in Fig. 3, the lugged ends of the-two elements of the splitsleeve 27 may be drawn toward each other by a rod 31 provided with reversely threaded sections 32 threaded into the cylindrical nuts 30, this rod being projected through one of the lugs and carrying on' its outer end a controlling handle 33 secured to the rod 81 by any well known means, such asa pin or bolt 34.

In the form of my improved device here in shown, I also provide a coiled spring 35 mounted concentric with the controlling rod 31 and abutting against the handle 33 and a. shoulder 36 formed on one of the lugs 29, the function of this spring being to maintain. at all .times a frictional enga-gementv in the threaded connection between the rod and one of the cylindrical nuts 30 to keep the handle from turning. By this improved construction it will be seen that when the handle is turned in one direction the lugs 29 are separated, and that when the handle'is turned in the opposite direction these lugs are drawn toward each other, the nuts 30 rotating in their retainers so as to prevent any binding action between the rod 31 and the lugs. It should be noted inane i6 that when the handle has been turned to any desired position for adjusting the relative positions of the two lugs, the cooperating threads on the bolt fill and the nuts Eli) function as multi-disc clutches and fric tionally retain the handle 38 in adjusted position.

The inner surface of the clamping ring is preferably recessed to receive a friction band 37 which engages the cylinder 5, takes the wear incident to the operation of the. braking device, and insures a proper frictional engagement between the -.]amping ring and the feed cylinder upon adjustment of the controlling handle 33.

If desired, the retarding device may consist only of the parts hereinbefore described, and may be mounted as is clearly shown in Fig. 1, it being clear that when the pressure fluid is admitted to the feed cylinder 5 to act upon the feed, piston 7, apart of the pressure which the pneumatic feeding device exerts upon the pneumatic tool maybe neutralized by rotating the handle 33 to cause the brake lining 37 to be forced into frictional engagement with the cylinder 5. As the tool is fed toward the work, the feed piston 'rod, acting through the yoke 19 and the side rods 24, holds the clamping ring stationary so that the pneumatic feed cylinder is drawn thercthrough, the coir struction of the braking device being such that the distance to which the stoping drill may be fed is the same as when the, braking device is not attached. It should llQ noted that with the preferred construction herein disclosed the braking device may be set for .the particular kind of work being drilled, and it will remain so set until it is desirable to change the action of the, braking mechanism on the pneumatic feed. which usually is necessary when the drill bit enters a different kind of rock.

Stoping drills are used for boring holes at all angles to the horizontal, including vertical holes driven in the roof of a mine, and stoping drills are often used for boring shafts substantially vertically upward. hen so used, the cuttings from the drill bit fall onto the operator and make. it difficult for him to follow the work or to watch his controlling handles. For this reason, I preferably mount the controlling handle 33 of the braking mechanism for guided movement in a predetermined path relative to the handle 18 which controls the flow of the pressure fluid. As shown. the guide rods 2i may be held against rotative movement relative to the cylinder 5 by lugs 38 which are preferably formed integral with the outer end of the feed cylinder. but. as is apparent to those skilled in the art. these lugs may be detachably secured to the cylinder.

The particular placing of the controlling handles as shown is thought to be prefer 4 g by Letters Patent is:

able, since in boring vertical holes the operator can stand in front of his machine with one hand on the handle 18 and the.

other hand' on the handle 33, it being un necessary, as the pneumatic tool moves upward, for the operator to cross his hands or to get confused when reachii'igfor one of the handles. With the lugs 38 formed on the cylinder 5, as shown, the braking mechanism may be applied with the handle 33 positioned directly below the handle 18, in which position it is very easy for the operator to control both the handles 18 and 83 with one hand, the other being used to grasp the handle to keep the pneumatic tool from rotating.

: held in adjusted position by the frictional engagement of the reverse threads 32 acting in the similarly threaded nuts 30, the oper-- ator can give his, attention particularly to the control of-the handle 18, it being only necessary to adiust the handle 33 when the drill bit enters a stratum of rock of a different kind. Y

if desired, ears 39 formed integral with or attached to the bushing 9 may be used instead of the ears 38 attached directly to the cylinder 5 for guiding the side rods 2%. ltisacommon practice in the manufacture of stoping drills now in use to keep the the bushing 9 from'rotating in the cylinder 5, by boring a hole, as shown at 40, in the bushing and by depressing a portion of the cylinder, as shown at 41, into this hole. Since this means keeps the bushing 9 from rotating in the cylinder 5., and since the ears 39 formed on this bushing keep the braking mechanism from rotating with reference to the bushing, the brake controlling handle 53 may be positioned, when the tool is as- I seinbled, as desired with respect to the fluid control handle 18. In this modified form, when applying the braking -mechanism to a stoping drill, it is only necessary'to supply a new bushing 9 instead of a new cylinder 5 as is-necessary when the guiding ears' are formed integral with the pneumatic feed cylinder.

lin the modified form shown in Figs. 5

and 6, only one side rod 42 is used, this rod preferably carrying a yoke having arms 48 which are rigidlyscured to the ears 26 on the s lit ring 27. In this form, ll preferably orm the guiding lug Minn the cylinder, and perferably use an apertured lug in place of the U-shapedlugs shown in Figs. 1 and 1,

. i t hile I have in this application specifically described several embodiments which my invention may assume in practice, it is to be understood that these forms are used for purposes of illustration, and that the invention may be embodied in various other forms' without departing from its spirit or' the scope of theappended claims.

Since the handle 33 is' ing a part of said feeding What I claim asnew and desire to secure 1. The combination with a work performing means and a feeding means therefor comprising coaxially arranged members, of feed varying means comprising a side rodsecured to the inner one of said members, and a braking device cooperating with said side rod and with the other of said members to control the relative longitudi- 'nal movements of. said two last mentioned members. i

2. The combination with a avork perform- -ing means and a. feeding means therefor lastmentioned members.

The combination with a work peift'ornn ing .means and a feeding means therefor comprising coaxially arranged members, the

outer of said members being secured to said work performing means, f feed varying means comprising a side rod secured to the inner one of said members, and a braking device cooperatin with said side. rod and with the other of said members to control the relative longitudinal movement of said two last mentioned members.

4. The combination with a work perfoi'n'iing means and a feeding means, of feed varying means comprising a side rod mounted on the feeding means, meanst'or guiding the side rod and the feeding means during relative movements thereof, and a member attached to said rod for frictionally engaging apart of said feeding means.

' 5. The combination with a stoping drill having a pneumatic tool and a pneumatic feeding means, of a feed varying means comprising a side rod mounted on the feeding means, means for guiding the side rod and the feeding means during relative movements thereof, and a member attached to said rod for frictionally engaging a part of said feeding means.

(3. The combination with a stoping drill having a pneumatic tool and a pneumatic feeding means, of a feed varying means comprising'a plurality of side rods mounted on the feeding means, means for guiding the side rods and the feeding means during relative movements thereof, and a member attached to said rods for frictionally engagmeans.

T. The combination with a pneumatic tool and a pneumatic feeding means therefor comprising a cylinder and a piston therein having a piston rod, of a guiding means carried by said cylinder, a rod connected to move with said piston rod and cooperating with said guiding means, and an adjustable frictional member attached to said last mentioned rod and engageable'with said cylinder. 8. The combination with a pneumatic tool and .a pneumatic feeding means therefor comprising a cylinder and a piston rod, of a feed 'arying means comprising a rod attached to said piston rod, and a cylinder engaging means attached to said rod.

9. The combination with a pneumatic tool and a pneumatic feeding means therefor comprising a cylinder and a piston rod, of a feed varying means comprising av rod attached to said piston rod, :1 cylinder engaging means attached to said rod, and means for guiding said feed varying means.

It). The combination with a pneumatic tool and a pneumatic feeding means therefor comprising a cylinder and a piston rod,

of a feed restraining means comprising a means and having a controlling handle having a fixed angular relation to said valve handle, and means comprising a .guide. rod relative to which said cylinder is movable and a cooperating lug carried by said cylinder for maintaining said angular relation.

12. The combination with a stoping drill having a pneumatic tool. and a pneumatic feeding means, of a feed varying means comprising a plurality of segmental, adjustable, frictional devices, and guiding means attached to one of said devices.

13. The combination with a stoping drill having a pneumatic tool, and a pneumatic feeding means, of a feed 'arying means comprising a plurality of segmental. adjustable, frictional devices. and guiding means attached to each of said devices.

l thThe combination with a pneumatic tool, and a pneumatic feeding means comprising a feed cylinder, of a feed varying .means comprising a plurality of segmental.

adjustable, frictional devices, guiding means attached to one of said devices, and cooperating guiding means carried by said cylinder.

15. The combination with a pneumatic tool, and pneumatic feeding means compris ing a feed cylinde' and a feed piston, of a feed varying means comprising a segmental. adjustable, frictional mechanism relative to which said cylinder is slidable, a guide rod attached to one of said segments. and m ans for attaching said guide rod to said feed piston;

16. The combination with a stoping drill having a pneumatic tool and a 'meumatic feeding means comprising a feed cylinder. of a feed varying means comprising a fric tional element in slidable relation to and in adjustable, frictional engagement with the feed cylinder, a guide rod carrying a yoke at one end thereof, and means for attaching said yoke to a part of said feeding means.

17. The combination with a stoping drill having a pneumatic tool and a pneumatic feeding means comprising a feed cylinder. of a feed varying means comprising a frietional element in slidable relation to and in adjustable, frictional engagement with the feed cylinder, a guiding means carried by said cylinder, a guide rod guided by said guiding means and carrying a yoke at one end thereofyand means for attaching said yoke to a part of said feeding means.

In testimony whereof I atiix my signa ture.

GEORGE ll. (HLUXN.

WMM ..mammalian. 

